Diversity of ocean acidification effects on marine N2 fixers ...

• Main Authors: Eichner, Meri, Rost, Björn, Kranz, Sven A
• Format: Dataset
• Language: English
• Published: PANGAEA 2014
• Subjects: Bacteria; Bottles or small containers/Aquaria <20 L; Calothrix rhizosoleniae; Cyanobacteria; Cyanothece sp.; Growth/Morphology; Laboratory experiment; Laboratory strains; Nodularia spumigena; Not applicable; Other metabolic rates; Pelagos; Phytoplankton; Primary production/Photosynthesis; Single species; Species; Treatment; Salinity; Temperature, water; Irradiance; pH; pH, standard deviation; Alkalinity, total; Alkalinity, total, standard deviation; Carbon, inorganic, dissolved; Carbon, inorganic, dissolved, standard deviation; Partial pressure of carbon dioxide water at sea surface temperature wet air; Partial pressure of carbon dioxide, standard deviation; Growth rate; Growth rate, standard deviation; Particulate organic carbon production, per chlorophyll a; Particulate organic carbon, production, standard deviation; Particulate organic nitrogen production, per chlorophyll a; Particulate organic nitrogen production, standard deviation; Carbon fixation rate, per chlorophyll a; Carbon fixation rate, per chlorophyll a, standard deviation; Ethene production, per chlorophyll a; Ethene production standard deviation; Carbon, organic, particulate/Nitrogen, organic, particulate ratio; Carbon, organic, particulate/Nitrogen, organic, particulate ratio, standard deviation; Ethene production per cell; Chlorophyll a per cell; Chlorophyll a, standard deviation; Particulate organic carbon, per cell; Particulate organic carbon content per cell, standard deviation; Particulate organic nitrogen per cell; Particulate organic nitrogen per cell, standard deviation; Carbonate system computation flag; Carbon dioxide; Fugacity of carbon dioxide water at sea surface temperature wet air; Ocean acidification
• Online Access: https://dx.doi.org/10.1594/pangaea.834555; https://doi.pangaea.de/10.1594/PANGAEA.834555

Considering the important role of N2 fixation for primary productivity and CO2 sequestration, it is crucial to assess the response of diazotrophs to ocean acidification. Previous studies on the genus Trichodesmium suggested a strong sensitivity towards ocean acidification. In view of the large functional diversity in N2 fixers, the objective of this study was to improve our knowledge of the CO2 responses of other diazotrophs. To this end, the single-celled Cyanothece sp. and two heterocystous species, Nodularia spumigena and the symbiotic Calothrix rhizosoleniae, were acclimated to two pCO2 levels (380 vs. 980 µatm). Growth rates, cellular composition (carbon, nitrogen and chlorophyll a) as well as carbon and N2 fixation rates (14C incorporation, acetylene reduction) were measured and compared to literature data on different N2 fixers. The three species investigated in this study responded differently to elevated pCO2, showing enhanced, decreased as well as unaltered growth and production rates. For ... : In order to allow full comparability with other ocean acidification data sets, the R package seacarb (Lavigne et al, 2014) was used to compute a complete and consistent set of carbonate system variables, as described by Nisumaa et al. (2010). In this dataset the original values were archived in addition with the recalculated parameters (see related PI). The date of carbonate chemistry calculation is 2014-07-30. ...